From: Sequence variants in oxytocin pathway genes and preterm birth: a candidate gene association study
 | SNP genotyping | Resequencing | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Case-control3 | Maternal triad4 | |||||||||||
 | U.S. | Argentina | Denmark | U.S. | Argentina | U.S. | ||||||
N =651 | Case ( N =123) | Control ( N =63) | P | Case ( N =723) | Control ( N =920) | P | Case ( N =443) | Control ( N =34) | P | N =187 | N =109 | |
GA (weeks) 1 | 31.1 ± 3.7 (21–36) | 33.1 ± 2.5 (27–36) | 39.4 ± 0.9 (37–41) | * | 33.7 ± 2.8 (20–36) | 40 | N/A | 30.3 ± 3.8 (22–36) | 38.9 ± 1.1 (37–41) | * | 32.6 ± 3.0 (23–36) | 32.0 ± 3.8 (24–36) |
 |  |  |  |  |  |  |  |  |  |  | [Unknown: 5] |  |
Infant BW (grams) 1 | 1739.4 ± 814.7 (332–4610) | 1834.8 ± 514 (830–3200) | 3514.1 ± 487 (2430–4950) | * | 2444 ± 648 (250–5270) | 3720.7 ± 457 (2400–5250) | * | 1606 ± 791 (332–4400) | 3495.2 ± 417.9 (2380–4275) | * | 1763.3 ± 527.2 (615–3040) | 1967.5 ± 778.2 (597–3691) |
 |  |  |  |  |  |  |  |  |  |  | [Unknown: 5] |  |
Infant gender (male/female) 2 | 373/278 | 65/57 | 31/32 | 0.64 | 385/338 | 482/438 | 0.77 | 249/194 | 20/14 | 0.85 | 99/87 | 54/55 |
 |  |  |  |  |  |  |  |  |  |  | [Unknown: 1] |  |
Maternal age at delivery (years) 1 | 27.8 ± 6.2 (14–46) | 24.7 ± 6.5 (15–48) | 26.0 ± 6.1 (16–40) | 0.22 | 29.1 ± 4.4 (17–44) | 29.7 ± 4.0 (18–42) | 0.001 | 27.7 ± 6.0 (14–44) | 27.9 ± 5.3 (18–40) | 0.86 | 23.2 ± 5.3 (16–39) | 30.3 ± 5.2 (18–41) |
 | [Unknown: 15] |  |  |  |  |  |  |  |  |  | [Unknown: 3] | [Unknown: 11] |